ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters PRODUCT OVERVIEW The ADS-917 is a high-performance, 14-bit, Digital input and output levels are TTL. 1MHz sampling A/D converter. This device samples Requiring ±15V (or ±12V) and +5V supplies, input signals up to Nyquist frequencies with no the ADS-917 dissipates 1.9W (1.6W for ±12V) missing codes. The ADS-917 features outstanding maximum. The unit is offered with a unipolar dynamic performance including a THD of –80dB. input (0 to +10V). Models are available for use in Housed in a small 24-pin DDIP or SMT (gull-wing) either commercial (0 to +70°C), industrial (–40 package, the functionally complete ADS-917 contains to +100°C), or HI-REL (–55 to +125°C) operating a fast-settling sample-hold amplifi er, a subranging temperature ranges. Applications include radar, (two-pass) A/D converter, a precise voltage reference, sonar, spectrum analysis, instrumentation, and timing/control logic, and error-correction circuitry. graphic/medical imaging. FEATURES INPUT/OUTPUT CONNECTIONS � 14-bit resolution PIN FUNCTION PIN FUNCTION � 1MHz sampling rate 1 BIT 14 (LSB) 24 –12V/–15V SUPPLY � 2 BIT 13 23 ANALOG GROUND Functionally complete; No missing codes 3 BIT 12 22 +12V/+15V SUPPLY � Edge-triggered; No pipeline delays 4 BIT 11 21 +10V REFERENCE OUT � Small 24-pin DDIP or SMT package 5 BIT 10 20 ANALOG INPUT � 6 BIT 9 19 ANALOG GROUND Low power, 1.9 Watts maximum 7 BIT 8 18 BIT 1 (MSB) � Operates from ±15V or ±12V supplies & 8 BIT 7 17 BIT 2 +5V supply 9 BIT 6 16 START CONVERT � Unipolar 0 to +10V input range (for bipolar ±5V 10 BIT 5 15 EOC input range see ADS-927) 11 BIT 4 14 DIGITAL GROUND 12 BIT 3 13 +5V SUPPLY BLOCK DIAGRAM DAC 18 BIT 1 (MSB) 17 BIT 2 +10V REF. OUT 21 REF 12 BIT 3 11 BIT 4 S2 10 BIT 5 FLASH 9 BIT 6 ADC 8 BIT 7 S/H S1 7 BIT 8 BUFFER 6 BIT 9 ANALOG INPUT 20 – 5 BIT 10 + 4 BIT 11 3 BIT 12 2 BIT 13 1 BIT 14 (LSB) START CONVERT 16 TIMING AND CONTROL LOGIC EOC 15 13 14 22 19, 23 24 +5V SUPPLY DIGITAL GROUND +12V/+15V SUPPLY ANALOG GROUND –12V/–15V SUPPLY Figure 1. ADS-917 Functional Block Diagram DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 1 of 9 REGISTER REGISTER DIGITAL CORRECTION LOGIC ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters PHYSICAL/ENVIRONMENTAL ABSOLUTE MAXIMUM RATINGS PARAMETERS MIN. TYP. MAX. UNITS PARAMETERS LIMITS UNITS Operating Temp. Range, Case +12V/+15V Supply (Pin 22) 0 to +16 Volts ADS-917MC, GC, MC-C, GC-C 0 — +70 °C –12V/–15V Supply (Pin 24) 0 to –16 Volts ADS-917ME, GE, ME-C, GE-C –40 — +100 °C +5V Supply (Pin 13) 0 to +6 Volts ADS-917MM, GM, MM-C, GM-C –55 — +125 °C Digital Input (Pin 16) –0.3 to +VDD +0.3 Volts ADS-917MM-QL, 883, MM-QL-C, 883-C –55 — +125 °C Analog Input (Pin 20) –4 to +17 Volts Thermal Impedance Lead Temperature (10 seconds) +300 °C θjc — 6 — °C/Watt θca — 24 — °C/Watt Storage Temperature Range –65 — +150 °C Package Type 24-pin, metal-sealed, ceramic DDIP or SMT Weight 0.42 ounces (12 grams) FUNCTIONAL SPECIFICATIONS (TA = +25°C, ±VCC = ±15V (or ±12V), +VDD = +5V, 1MHz sampling rate, and a minimum 1 minute warmup ➀ unless otherwise specifi ed.) +25°C 0 TO +70°C –55 TO +125°C ANALOG INPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS Input Voltage Range ➁ — 0 to +10 — — 0 to +10 — — 0 to +10 — Volts Input Resistance — 1 — — 1 — — 1 — kΩ Input Capacitance — 7 15 — 7 15 — 7 15 pF DIGITAL INPUT Logic Levels Logic "1" +2.0 — — +2.0 — — +2.0 — — Volts Logic "0" — — +0.8 — — +0.8 — — +0.8 Volts Logic Loading "1" — — +20 — — +20 — — +20 μA Logic Loading "0" — — –20 — — –20 — — –20 μA Start Convert Positive Pulse Width ➂ 20 200 — 20 200 — 20 200 — ns STATIC PERFORMANCE Resolution — 14 — — 14 — — 14 — Bits Integral Nonlinearity (fin = 10kHz) — ±0.5 — — ±0.75 — — ±1.5 — LSB Differential Nonlinearity (fin = 10kHz) — ±0.5 +0.95 — ±0.5 ±0.95 -0.95 ±0.75 +1.25 LSB Full Scale Absolute Accuracy — ±0.05 ±0.1 — ±0.1 ±0.2 — ±0.15 ±0.4 %FSR Unipolar Offset Error (Tech Note 2) — ±0.1 ±0.2 — ±0.1 ±0.2 — ±0.15 ±0.3 %FSR Gain Error (Tech Note 2) — ±0.1 ±0.25 — ±0.1 ±.025 — ±0.25 ±0.4 % No Missing Codes (fin = 10kHz) 14 — — 14 — — 14 — — Bits DYNAMIC PERFORMANCE Peak Harmonics (–0.5dB) dc to 100kHz — –87 –82 — –87 –82 — –85 –80 dB 100kHz to 500kHz — –81 –76 — –81 –76 — –79 –74 dB Total Harmonic Distortion (–0.5dB) dc to 100kHz — –85 –82 — –85 –82 — –84 –80 dB 100kHz to 500kHz — –80 –76 — –80 –76 — –79 –74 dB Signal-to-Noise Ratio (w/o distortion, –0.5dB) dc to 100kHz 75 79 — 75 79 — 73 77 — dB 100kHz to 500kHz 73 78 — 73 78 — 72 76 — dB Signal-to-Noise Ratio ➃ (& distortion, –0.5dB) dc to 100kHz 74 77 — 74 77 — 72 76 — dB 100kHz to 500kHz 72 76 — 72 76 — 71 75 — dB Two-tone Intermodulation Distortion (fin = 100kHz, 500kHz, fs = 1MHz –0.5dB) — –87 — — –86 — — –85 — dB Noise —300——400——600—μVrms Input Bandwidth (–3dB) Small Signal (–20dB input) — 7 — — 7 — — 7 — MHz Large Signal (–0.5dB input) — 5 — — 5 — — 5 — MHz Feedthrough Rejection (fin = 500kHz) — 84 — — 84 — — 84 — dB Slew Rate — ±60 — — ±60 — — ±60 — V/μs Aperture Delay Time — ±20 — — ±20 — — ±20 — ns Aperture Uncertainty — 5 — — 5 — — 5 — ps rms S/H Acquisition Time (to ±0.003%FSR, 10V step) 530 570 610 530 570 610 530 570 610 ns Overvoltage Recovery Time ➄ —4001000—4001000—4001000ns A/D Conversion Rate 1 — — 1 — — 1 — — MHz DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 2 of 9 ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters +25°C 0 TO +70°C –55 TO +125°C ANALOG OUTPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS Internal Reference Voltage +9.95 +10.0 +10.05 +9.95 +10.0 +10.05 +9.95 +10.0 +10.05 Volts Drift — ±5 — — ±5 — — ±5 — ppm/°C External Current — — 1.5 — — 1.5 — — 1.5 mA DIGITAL OUTPUTS Logic Levels Logic "1" +2.4 — — +2.4 — — +2.4 — — Volts Logic "0" — — +0.4 — — +0.4 — — +0.4 Volts Logic Loading "1" — — –4 — — –4 — — –4 mA Logic Loading "0" — — +4 — — +4 — — +4 mA Delay, Falling Edge of EOC to Output Data Valid — — 35 — — 35 — — 35 ns Output Coding Straight Binary POWER REQUIREMENTS , ±15V Power Supply Ranges +15V Supply +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 Volts –15V Supply –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 Volts +5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts Power Supply Currents +15V Supply — +50 +70 — +50 +70 — +50 +70 mA –15V Supply — –41 –50 — –41 –50 — –41 –50 mA +5V Supply — +70 +85 — +70 +85 — +70 +85 mA Power Dissipation — 1.7 1.98 — 1.7 1.98 — 1.7 1.98 Watts Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V POWER REQUIREMENTS, ±12V Power Supply Ranges +12V Supply +11.5 +12.0 +12.5 +11.5 +12.0 +12.5 +11.5 +12.0 +12.5 Volts –12V Supply –11.5 –12.0 –12.5 –11.5 –12.0 –12.5 –11.5 –12.0 –12.5 Volts +5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts Power Supply Currents +12V Supply — +50 +65 — +50 +65 — +50 +65 mA –12V Supply — –40 –48 — –40 –48 — –40 –48 mA +5V Supply — +70 +80 — +70 +80 — +70 +80 mA Power Dissipation — 1.4 1.6 — 1.4 1.6 — 1.4 1.6 Watts Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V Footnotes: ➃ Effective bits is equal to: ➀ All power supplies must be on before applying a start convert pulse. All supplies and Full Scale Amplitude (SNR + Distortion) – 1.76 + 20 log the clock (START CONVERT) must be present during warmup periods. The device Actual Input Amplitude must be continuously converting during this time. There is a slight degradation in 6.02 performance when using ±12V supplies. ➁ See Ordering Information for availability of ±5V input range. Contact DATEL for ➄ This is the time required before the A/D output data is valid once the analog input is availability of other input voltage ranges. back within the speciŢ ed range. ➂ A 1MHz clock with a 200ns wide start convert pulse is used for all production testing. See Timing Diagram for more details. TECHNICAL NOTES 1. Obtaining fully specifi ed performance from the ADS-917 requires care- can be reduced to zero using the input circuit of Figure 2. When using this ful attention to pc-card layout and power supply decoupling. The device's circuit, or any similar offset and gain-calibration hardware, make adjust- analog and digital ground systems are connected to each other internally. ments following warmup. To avoid interaction, always adjust offset before For optimal performance, tie all ground pins (14, 19 and 23) directly to a gain. large analog ground plane beneath the package. 3. When operating the ADS-917 from ±12V supplies, do not drive external Bypass all power supplies and the REFERENCE OUTPUT (pin 21) to ground circuitry with the REFERENCE OUTPUT. The reference's accuracy and drift with 4.7μF tantalum capacitors. Locate the bypass capacitors as close to specifi cations may not be met, and loading the circuit may cause accuracy the unit as possible. If the user-installed offset and gain adjusting circuit errors within the converter. shown in Figure 2 is used, also locate it as close to the ADS-917 as pos- 4. Applying a start convert pulse while a conversion is in progress (EOC = sible. logic "1") initiates a new and inaccurate conversion cycle. Data from the 2. The ADS-917 achieves its specifi ed accuracies without the need for exter- interrupted and subsequent conversions will be invalid. nal calibration. If required, the device's small initial offset and gain errors DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 3 of 9 ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters Gain adjusting is accomplished when all bits are 1's and the LSB just CALIBRATION PROCEDURE (Refer to Figures 2 and 3) changes from a 1 to a 0. This transition ideally occurs when the analog Any offset and/or gain calibration procedures should not be implemented input is at +full scale minus 1½ LSB's (+9.999085V). until devices are fully warmed up. To avoid interaction, offset must be Zero/Offset Adjust Procedure adjusted before gain. The ranges of adjustment for the circuit of Figure 2 are guaranteed to compensate for the ADS-917's initial accuracy errors 1. Apply a train of pulses to the START CONVERT input (pin 16) so the con- and may not be able to compensate for additional system errors. verter is continuously converting. If using LED's on the outputs, a 200kHz conversion rate will reduce fl icker. All fi xed resistors in Figure 2 should be metal-fi lm types, and multiturn potentiometers should have TCR’s of 100ppm/°C or less to minimize drift 2. Apply +305μV to the ANALOG INPUT (pin 20). with temperature. 3. Adjust the offset potentiometer until the output bits are all 0's and the LSB A/D converters are calibrated by positioning their digital outputs exactly fl ickers between 0 and 1. on the transition point between two adjacent digital output codes. This can Gain Adjust Procedure be accomplished by connecting LED's to the digital outputs and adjusting until certain LED's "fl icker" equally between on and off. Other approaches 1. Apply +9.999085V to the ANALOG INPUT (pin 20). employ digital comparators or microcontrollers to detect when the outputs change from one code to the next. 2. Adjust the gain potentiometer until the output bits are all 1's and the LSB fl ickers between 1 and 0. For the ADS-917, offset adjusting is normally accomplished at the point where the output bits are 0's and the LSB just changes from a 0 to a 1. This digital output transition ideally occurs when the applied analog input Table 1. Zero and Gain Adjust is +½ LSB (+305μV). INPUT VOLT- ZERO ADJUST GAIN ADJUST +15V AGE RANGE +½ LSB +FS –1½ LSB 2k 20kΩ 200kΩ Ω ZERO/ 0 to +10V +305μV +9.999085V OFFSET ADJUST GAIN Table 2. Output Coding ADJUST –15V +15V DIGITAL OUTPUT 1.98kΩ SIGNAL INPUT VOLTAGE INPUT UNIPOLAR SCALE To Pin 20 OFFSET BINARY 50Ω (0 TO +10V) of ADS-917 MSB LSB +9.999390 +FS –1LSB 11 1111 1111 1111 –15V +7.500000 +3/4 FS 11 0000 0000 0000 Figure 2. ADS-917 Calibration Circuit +5.000000 +1/2 FS 10 0000 0000 0000 +2.500000 +1/4 FS 01 0000 0000 0000 +0.000610 +1LSB 00 0000 0000 0001 0.000000 0 00 0000 0000 0000 Coding is straight binary; 1LSB = 610μV. 18 BIT 1 (MSB) +5V 13 17 BIT 2 + 12 BIT 3 4.7μF 0.1μF DIGITAL 11 BIT 4 14 GROUND 10 BIT 5 9 BIT 6 ADS-917 8 BIT 7 –12V/–15V 24 7 BIT 8 4.7μF 0.1μF + 6 BIT 9 ANALOG 19, 23 GROUND 5 BIT 10 4.7μF 0.1μF 4 BIT 11 + +12V/+15V 22 3 BIT 12 2 BIT 13 ANALOG 0 to +10V 20 INPUT 1 BIT 14 (LSB) 15 EOC 21 +10V REF. OUT + START 0.1μF 4.7μF 16 CONVERT Figure 3. Typical ADS-917 Connection Diagram DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 4 of 9 ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters THERMAL REQUIREMENTS devices do not overheat. The ground and power planes beneath the package, All DATEL sampling A/D converters are fully characterized and speci- as well as all pcb signal runs to and from the device, should be as heavy as fi ed over operating temperature (case) ranges of 0 to +70°C and –55 possible to help conduct heat away from the package. to +125°C. All room-temperature (TA = +25°C) production testing is performed without the use of heat sinks or forced-air cooling. Thermal Electrically-insulating, thermally-conductive "pads" may be installed impedance fi gures for each device are listed in their respective specifi ca- underneath the package. Devices should be soldered to boards rather than tion tables. "socketed," and of course, minimal air fl ow over the surface can greatly help reduce the package temperature. These devices do not normally require heat sinks, however, standard precautionary design and layout procedures should be used to ensure N N+1 START CONVERT 200ns typ. 10ns typ. Acquisition Time Hold INTERNAL S/H 430ns typ. 570ns ±40ns 70ns ±10ns 90ns typ. EOC Conversion Time 420ns ±20ns 35ns max. 74ns max. OUTPUT Data (N – 1) Valid Data N Valid DATA Invalid Invalid 926ns min. 926ns min. Data Data Notes: 1. fs = 500kHz. 2. The ADS-917 is an edge-triggered device. All internal operations are triggered by the rising edge of the start convert pulse, which may be as narrow as 20nsec. All production testing is performed at a 1MHz sampling rate with 200nsec wide start pulses. For lower sampling rates, wider start pulses may be used, however, a minimum pulse width low of 20nsec must be maintained. Figure 4. ADS-917 Timing Diagram DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 5 of 9 ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 6 of 9 Figure 5. ADS-917 Evaluation Board Schematic ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 0 50 100 150 200 250 300 350 400 450 500 Frequency (kHz) (fs = 1MHz, fin = 480kHz, Vin = –0.5dB, 16,384-point FFT) Figure 6. ADS-917 FFT Analysis +0.41 0 –0.33 0 16,384 Digital Output Code 0 16,384 Digital Output Code Figure 7. ADS-917 Histogram and Differential Nonlinearity DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 7 of 9 Amplitude Relative to Full Scale (dB) Number of Occurrences DNL (LSB's) ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27) 24-Pin DDIP Dimension Tolerances (unless otherwise indicated): Versions 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 24 13 Lead Material: Kovar alloy ADS-917MC 0.80 MAX. Lead Finish: 50 microinches (minimum) gold plating (20.32) ADS-917ME over 100 microinches (nominal) nickel plating 112 ADS-917MM ADS-917/883 ADS-917MC-C 0.100 TYP. (2.540) ADS-917ME-C 1.100 (27.940) ADS-917MM-C 0.235 MAX. ADS-917-C/883 (5.969) PIN 1 INDEX 0.200 MAX. (5.080) +0.002 0.010 –0.001 (0.254) 0.190 MAX. 0.100 0.100 (4.826) (2.540) (2.540) 0.600 ±0.010 SEATING (15.240) PLANE 0.040 0.018 ±0.002 0.025 (1.016) (0.457) (0.635) 1.31 MAX. 24-Pin (33.02) Surface Mount Versions Dimension Tolerances (unless otherwise indicated): 13 24 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) ADS-917GC Lead Material: Kovar alloy ADS-917GE 0.80 MAX. (20.32) Lead Finish: 50 microinches (minimum) gold plating ADS-917GM over 100 microinches (nominal) nickel plating ADS-917G/883 1 12 ADS-917GC-C ADS-917GE-C ADS-917GM-C 0.020 TYP. 0.060 TYP. ADS-917G-C/883 0.015 (0.508) (1.524) 0.190 MAX. (0.381) (4.826) 0.130 TYP. MAX. radius PIN 1 for any pin (3.302) INDEX 0.100 (2.540) 0.020 0.010 TYP. (0.508) (0.254) 0.100 TYP. 0.040 (2.540) (1.016) DATEL, Inc. 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 8 of 9 ADS-917 14-Bit, 1MHz, Low-Power Sampling A/D Converters ORDERING GUIDE OPERATING MODEL NUMBER PACKAGE ROHS TEMPERATURE RANGE ADS-917MC 0 to +70°C DDIP No ADS-917MC-C 0 to +70°C DDIP Yes ADS-917ME –40 to +100°C DDIP No ADS-917ME-C –40 to +100°C DDIP Yes ADS-917MM –55 to +125°C DDIP No ADS-917MM-C –55 to +125°C DDIP Yes ADS-917MM-QL –55 to +125°C DDIP No ADS-917MM-QL-C –55 to +125°C DDIP Yes ADS-917/883 –55 to +125°C DDIP No ADS-917-C/883 –55 to +125°C DDIP Yes ADS-917GC 0 to +70°C SMT No ADS-917GC-C 0 to +70°C SMT Yes ADS-917GE –40 to +100°C SMT No ADS-917GE-C –40 to +100°C SMT Yes ADS-917GM –55 to +125°C SMT No ADS-917GM-C –55 to +125°C SMT Yes ADS-917G/883 –55 to +125°C SMT No ADS-917G-C/883 –55 to +125°C SMT Yes For bipolar analog input ±5V see ADS-927 data sheet. DATEL is a registered trademark of DATEL, Inc. DATEL, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of 11 Cabot Boulevard, MansŢ eld, MA 02048-1151 USA licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. ITAR and ISO 9001/14001 REGISTERED © 2015 DATEL, Inc. www.datel.com • e-mail: help@datel.com MDA_ADS-917.C02 Page 9 of 9